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Finding the Fourth Proportional to 878.41, 1,212.14 and 485.45

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Solution

The fourth proportional to 878.41, 1,212.14 and 485.45 is: 669.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.41 : 1,212.14 = 485.45 : x
  2. Step 2: Convert to fraction form
    878.41/1,212.14 = 485.45/x
  3. Step 3: Cross multiply
    878.41x = 1,212.14 × 485.45
  4. Step 4: Simplify right side
    878.41x = 588,428.52
  5. Step 5: Solve for x
    x = 588,428.52/878.41
  6. Step 6: Final answer
    x = 669.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.